Sixth-grade math teacher Eric Marcos credits his students with the creation and global popularity of MathTrain.TV, a collection of video math tutorials created by and for students. The tool now includes a podcast and iPhone and iPad compatibility to let students share videos on Twitter and Facebook. Students enjoy creating the videos, and "[t]hey'll spend over an hour on one math problem. ... Instead of listening to the teacher, they're taking an active role in their own learning," Marcos said.